Twins? No Problem for 'Relaxed' Mom Rebecca Romijn

Just three months after giving birth to twins Dolly Rebecca Rose and Charlie Tamara Tulip, Rebecca Romijn is taking motherhood in stride.

"She's the most relaxed mom I've ever seen," actress Lindsay Price, Romijn's costar in the upcoming ABC series Eastwick, told PEOPLE Wednesday at a party for Charlotte Ronson and Shoshanna Lonstein Gruss's Made With Love swimwear line hosted by Lucky magazine at New York City's Thompson LES hotel. "With twins and the demanding schedule of one-hour television, she keeps her cool. She never drops a line. She's completely present. I don't know how she does it.”

And though Romijn, 36, has been back at work playing a single mom-turned-witch on the Eastwick set (a show based on the John Updike novel The Witches of Eastwick, which also spawned a 1987 movie starring Cher, Michelle Pfeiffer and Susan Sarandon), her daughters are never far from the devoted mom.

"They're there every day," says Price. "They're so unbelievably cute. Dolly looks just like Rebecca. And Charlie looks just like [dad] Jerry [O'Connell]. They're beautiful babies. And whenever we were around them, they were completely silent. I think that's a blessing. They're very sweet-natured. I think her personality rubs off on them. Rebecca has this easygoing, centered personality."

In November, Romijn told PEOPLE she and husband O'Connell had plans to be "very hands-on" parents. "This is something we're really looking forward to," she said. "I'm really excited to see what happens next and to visit a completely different chapter in my life."